CiloGear 45L WorkSack Review

Overview

The 45L WorkSack is a top-loading alpine climbing pack, sewn to order in Portland, Oregon, and built around the idea that every component should be optional. Strip it to the bare bag and it weighs 790 g. Load it with lid, hip belt, framesheet, bivy pad and a full strap set and it reaches 1,870 g. The trade-off is that the fabrics are light enough that long-term owners report wear in the thinnest spots.

Key Specs

Spec	Detail
Weight	790 g stripped (bag only) to 1,870 g fully built
Volume	45 L, extendable by owners’ accounts to roughly 75 L with the collar
Design	Top-loader with lid, one main compartment, internal “ninja” pocket, two lid pockets
Suspension	Removable framesheet (HDPE sheet plus aluminum stay), removable hip belt
Back padding	Removable closed-cell foam bivy pad that doubles as a sleeping pad
Straps	Modular set; owners report positions are reconfigurable
Component weights	Hip belt about 150 g, lid about 170 g, ten straps about 160 g, framesheet and pad about 550 g
Fabric	Owners report Dimension Polyant VX21/VX42 on the standard pack
Made in	Portland, Oregon, USA, built to order

Performance

Modularity. The WorkSack’s defining feature is that nearly everything comes off. Outdoor Gear Lab’s testers named it the most versatile pack in their mountaineering test. They described a pack that goes from a padded approach hauler with gear strapped all over it to “an almost empty envelope” for the crux pitches. Stripped of lid, framesheet, hip belt and straps, it was only slightly behind the Arc’teryx Alpha FL 45 in weight-to-volume. The difference is that the Alpha keeps a minimal belt and a thin foam pad, while the bare WorkSack is essentially a large stuff sack. Fully built, the same testers put it at 27.2 g/L, the heaviest in that test. They also noted that most testers rarely used all the straps and many used none.

Carry. This is where owners are most consistently enthusiastic. One climber who tested it with drill, bolts and ropes called it the nicest-carrying pack he had used. Another reviewer attributed the stability to compression straps that anchor near the framesheet, so the load moves as one rigid unit. Long-term owners say they routinely carry around 40 lb comfortably. One reviewer who used it for fieldwork with 30–50 lb loads put the comfortable ceiling near 45 lb and said it falls short of a dedicated heavy-haul backpacking pack. The framesheet can be bent to match the wearer’s back. Because the hip belt height is adjustable, the pack can be sized by back length with the belt placed where it fits. WildSnow’s tester found the belt wide and stiff, and he wanted stiffer shoulder-strap foam than the pack has.

Stripped-down limits. WildSnow’s tester removed the frame for a day trip and found it fine until skis and boots went on the outside. The unsupported sack then slumped and curved under the leverage. The pack compresses well: with both sides cinched and the lid stowed inside, he got it down to something like 20 L.

Fit and shape. The profile is narrow and low, which suits climbing. One reviewer noted the bottom tapers to an awkward shape that takes some packing. Outdoor Gear Lab’s testers found it runs tall for its volume, and testers of all body types bumped a helmeted head on the top of the pack while route-finding.

Durability. This is the main reservation. Outdoor Gear Lab’s testers rated abrasion resistance as average and flagged a possible shoulder strap flaw. Mountain Project owners agree that the light interior fabrics are the weak spot. One reported the taffeta forming the framesheet pocket ripped within a year, along with the pocket under the lid. Another long-time owner said the fabric under the lid is thin enough that anything sharp will eventually cut it. Others are happier. One owner reports about five years of daily abuse, including 200 nights out and a crampon puncture of about an inch, and no plans to replace the pack. The practical rule is to pad sharp gear and treat the pack as a carry system rather than armor.

Hiking use. The WorkSack works for alpine backpacking, though one BPL member who used it as a primary pack for two years rated it 3.9 out of 5 for that use. His view was that it is a respectable weight for a burly mountaineering pack but heavier than most backpackers need. Thru-hikers counting grams will find lighter frameless options.

Pros & Cons

Pros

• Weight ranges from 790 g to 1,870 g, so one pack covers the approach and the summit push
• Carries 40 lb loads well for a pack this light, with a bendable framesheet and adjustable belt
• Bivy pad doubles as a sleeping pad and back padding
• Strap positions can be rearranged for skis, tools, and other external loads
• Compresses to about 20 L and extends well beyond 45 L
• Made in the USA to order, with sizing by back length

Cons

• Interior fabrics wear in the thinnest spots, especially the framesheet pocket and the lid underside
• Built to order, so there is a wait, which Outdoor Gear Lab’s testers flagged
• Tall for its volume and prone to bumping a climbing helmet
• Heaviest in its test when fully loaded with every strap
• Without the frame, loads with skis or boots sag
• Too heavy to suit gram-counting backpackers

Who Should Buy This

Alpine climbers, ski mountaineers and winter-route climbers who want one pack for heavy approaches and a stripped summit bag will get the most from it. It also suits anyone who likes to adjust strap positions and add external loads. Thru-hikers and fastpackers shopping for the lightest possible frameless sack should look elsewhere, as should anyone who wants a pack ready to ship without a wait. So should climbers who regularly haul sharp loads and want abrasion resistance above all.

Verdict

For its target user, the WorkSack remains one of the most adaptable alpine packs available, and owners consistently praise how it carries. The light interior fabrics keep it from a higher rating, and they argue for careful packing. Climbers should buy it. Backpackers chasing base weight should not.